Fix a crash on spoilers

telegram/formatter/formatter.go

@@ -98,6 +98,10 @@ func EntityToMarkdown(entity *client.TextEntity) (*Insertion, *Insertion) {
 
 // EntityToXEP0393 generates the wrapping XEP-0393 tags
 func EntityToXEP0393(entity *client.TextEntity) (*Insertion, *Insertion) {
+	if entity == nil || entity.Type == nil {
+		return nil, nil
+	}
+
 	switch entity.Type.TextEntityTypeType() {
 	case client.TypeTextEntityTypeBold:
 		return markupBraces(entity, boldRunesXEP0393, boldRunesXEP0393)